What is needed and what has not seemingly occurred yet is for someone to trace all the logical possibilities of each spiritual idea/claim, to fully elaborate each thread of possibility and place them in a hierarchy of most likely to least likely. Once that is finished for each individual spiritual idea or claim, then these can be layered atop each other to see where the logic trees overlap and where they deviate from each another.
Those points at which the logic trees overlap or coincide, would constitute a new logic tree that should theoretically give us a true picture of what spiritual ideas/claims actually do exist. Likewise and in the inverse, we should be able to detect where certain ideas/claims are logically impossible given mutual exclusivity. Basically, it should be the case that only a single sum total picture and possibility emerges from combining all the logic trees together; that one picture which non-contradictingly satisfies each of the logic trees in all their possibilities and violates none of them necessarily, would be the true picture of reality. Or at least the truest picture we can come up with, like a snapshot image of the metaphysical taken through a camera obscura.
Why does no philosophy or science exist that has even attempted this? Because most philosophers and scientists have not achieved their discipline, they have yet to succeed and ‘win’ the field of truth and so remain ignorant of the fact that the far end of philosophy and science push up against the so-called spiritual possibilities. The easiest way to understand spiritual is to demarcate those ideas/claims that cannot be proven or disproven yet, for one reason or another, remain staunchly with us as possibilities unable to be entirely dismissed without committing serious logical errors such as deliberately ignoring or dismissing out of hand the countless personal testimonies and eye witness accounts of supernatural/spiritual experiences. The sheer volume and ubiquity of these claimed experiences alone logically militates against summarily dismissing them all out of hand, yet that is precisely what most philosophers and scientists do. They are inadequately rational and objective enough to see that their dismissals are irrational and founded not in logic but in their own emotional need to remain firmly situated in their respective fields without wanting to come into contact with the far-edge of those fields, namely with the points at which their own fields of philosophy or science utterly fail to illuminate truths about certain things. For example, “are there gods/other “higher” beings? Is there other intelligence life? Are there ghosts? Do humans have parapsychological abilities such as telepathy and psychokinesis? Are there beings we might call angels and demons? Do humans have spirits or souls, or does some part of us survive death? Are cryptozoological creatures like Bigfoot real?”
There exists a sum total of those sort of questions. The next task of philosophy and science, once the practitioner of either has fully achieved success in his field, is to fully list those questions and for each one trace its logical possibilies and impossibilities as comprehensively and clearly as possible, overlooking nothing relevant and ranking likelihoods and evidences as properly and objectively as possible, then to take all of those ‘logic trees’ and lay them atop each other to see where they intersect or not. That would be a spiritual ‘map’ that could actually illuminate us about the realities of so-called spiritual or supernatural things.